P8 平台轻量化改造 + SSG修复 + 编程导师 + 文档完善

- Prisma: Tool 模型加 affiliateLink；免费用户沙盒 10→5 次/日
- 后端: Tools API + /admin/tools CRUD 5 端点；Practices 完整模块
- 导航: 主菜单隐藏企业版/社区（URL 可访问）
- 首页: 重定位为 AI 工具指南；新增精选工具区块；Feature 重写
- 工具页: affiliateLink 绿色推荐 Badge
- SSG 修复: config.ts 构建时直连 localhost:4000，页面 108→127
- 沙盒: 新增编程导师场景（苏格拉底教学法）
- 练习系统: Practices 多场景练习（含结构化评分）
- 技能广场: 6 个付费 Skill（标题大师/回款助手等）
- 管理后台: Models/Posts/Practices CRUD 页面
- 文档: README + progress.md 全面更新；AGENTS.md 同步定位
- 清理: .env.example 移除；tsbuildinfo gitignore

frontend/package.json

@@ -43,6 +43,7 @@
     "autoprefixer": "^10.5.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "dompurify": "^3.4.9",
     "framer-motion": "^12.38.0",
     "highlight.js": "^11.11.1",
     "lucide-react": "^1.14.0",
@@ -52,6 +53,7 @@
     "qrcode": "^1.5.4",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
+    "react-is": "^18.3.1",
     "recharts": "^3.8.1",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.6.0",
@@ -62,12 +64,12 @@
     "@playwright/test": "^1.60.0",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
+    "@types/dompurify": "^3.0.5",
     "@types/qrcode": "^1.5.6",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@typescript-eslint/eslint-plugin": "^8.60.0",
     "@typescript-eslint/parser": "^8.60.0",
-    "@vitejs/plugin-react": "^6.0.1",
     "eslint": "^8.57.1",
     "eslint-config-next": "^16.2.6",
     "jsdom": "^29.1.1",